HTTP/2: fixed worker_shutdown_timeout.

src/http/v2/ngx_http_v2.c

diff --git a/src/http/v2/ngx_http_v2.c b/src/http/v2/ngx_http_v2.c
index db95bdd..d0e4447 100644
--- a/src/http/v2/ngx_http_v2.c
+++ b/src/http/v2/ngx_http_v2.c
@@ -354,6 +354,11 @@
     if (c->close) {
         c->close = 0;
 
+        if (c->error) {
+            ngx_http_v2_finalize_connection(h2c, 0);
+            return;
+        }
+
         if (!h2c->goaway) {
             h2c->goaway = 1;